package com.gaotai.wangfei.exam.util;

/**
 * 
 * <p>
 * Description: [String工具类]
 * </p>
 * 
 * @author <a href="mailto: wangfei@gaotai.cn">王飞</a>
 * @version $Revision$
 */
public class StringUtils
{

	private StringUtils()
	{}

	/**
	 * 
	 * <p>
	 * 判断字符串是否为空
	 * </p>
	 * 
	 * @param param
	 * @return
	 * @author:wangfei 2016-3-10
	 * @update: [updatedate] [changer][change description]
	 */
	public static boolean isNullString(String param)
	{

		return param == null || "".equals(param.trim()) || "null".equals(param.trim());
	}
}
